The Sud-Ouest reports here the decisions and bye-law that have been decided to try to combat the tragic deaths of students following lively festivities near the river.
Essentially one can no longer drink in the streets of Bordeaux. Exceptions are obviously if you are in a restaurant or on the terrace of a restaurant.
Families picnicking together on the waterfront may also drink but not from glasses and the drink must not be carried in bottles. This latter probably has more to do with dangerous litter than with drowning - wine in boxes is no less strong than in bottles, I guess, though I suppose with bottles there's a certain pressure to drink the lot ?